Strip markdown code fences (```json ... ```) from LLM responses before
json.loads() in agenerate_schema(). Anthropic models wrap JSON output
in markdown fences when litellm silently drops the unsupported
response_format parameter, causing json.loads("") parse failures.
- Add _strip_markdown_fences() helper to extraction_strategy.py
- Apply fence stripping + empty response check in agenerate_schema()
- Separate JSONDecodeError for clearer error messages
- Add 34 tests: unit, real API integration (Anthropic/OpenAI/Groq
against quotes.toscrape.com), and regression parametrized
911bbce8b1